Abstract
Movement disorders in first-episode psychosis are increasingly recognized; however, the prevalence and clinical correlates areuncertain. We compared antipsychotic exposed (< 12 weeks) with nonexposed first-episode patients, and report prevalence as well as clinical and demographic variables associated with extrapyramidal dysfunction. Data are baseline assessments from a multicentre, international drug trial of first-episode psychosis (n = 535). Analysis included the Extrapyramidal Symptom Rating Scale, Premorbid Adjustment Scale, and the Positive and Negative Syndrome Scale. Of non-exposed patients, 28.1% (n = 47/167) had at least one mild sign of extrapyramidal dysfunction, as did 46.3% (n = 169/365) of previously exposed patients. Hypokinetic Parkinsonism was the most prevalent disorder. The severity of movement disorders and negative symptoms were correlated; however, the effect sizes were small. Logistic regression analysis indicated that the salient risk factors for all patients were: previous antipsychotic exposure [odds ratio (OR) = 2.4; 95% confidence interval (CI) 1.6–3.6] and poor premorbid functioning (OR = 1.8; 95% CI 1.2–2.6). For the non-exposed group (n = 167), the significant risk factors were: having severe mental illness in the family (OR = 2.9; 95% CI 1.2–7.2) and poor premorbid functioning (OR = 2.3; 95% CI 1.0–5.3). For the previously exposed group (n = 368), thesignificant variables were: poor premorbid functioning (OR = 1.8; 95%CI 1.2–2.8) and shorter duration of untreated psychosis (OR = 0.78; 95% CI 0.64–0.94). Although antipsychotic exposure was associated with extrapyramidal signs, the results indicate that many first-episode patients with no exposure to antipsychotics also had extrapyramidal dysfunction. In this group, family history and poor premorbid functioning appear to be associated with increased risk for movement disorders.
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